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Showing 1–13 of 13 results
Advanced filters: Author: Jean M. J. Fréchet Clear advanced filters

  • The efficiency of organic blends used for photovoltaic applications depends on their ability to convert photoexcited charges into free holes and electrons. It is now demonstrated that the lowermost energetic states formed at the donor/acceptor interface can reach conversion efficiencies close to 100%, and therefore do not behave as traps for charge carriers.

    • Koen Vandewal
    • Steve Albrecht
    • Alberto Salleo
    Research
    Nature Materials
    Volume: 13, P: 63-68

  • A latent diffusion model pre-trained on pairs of natural images and text descriptors can be adapted to generate diverse and visually plausible synthetic chest X-ray images whose appearance can be controlled with free-form medical text prompts.

    • Christian Bluethgen
    • Pierre Chambon
    • Akshay S. Chaudhari
    Research
    Nature Biomedical Engineering
    Volume: 9, P: 494-506

  • Hyperbranched polymers have desirable properties as novel materials, and may be synthesized from homopolymerization of multi-vinyl momomers, although this can form insoluble products at low conversions. Here, the authors produce hyperbranched polymers in high yield owing to a kinetic control mechanism.

    • Tianyu Zhao
    • Yu Zheng
    • Wenxin Wang
    Research
    Nature Communications
    Volume: 4, P: 1-8

  • The power-conversion efficiency of dye-sensitized solar cells is increased by 26% by using energy relay dyes. The scheme aids the absorption of high-energy photons that undergo Förster resonant energy transfer to a sensitizing dye, and may offer a viable pathway for developing more efficient dye-sensitized solar cells.

    • Brian E. Hardin
    • Eric T. Hoke
    • Michael D. McGehee
    Research
    Nature Photonics
    Volume: 3, P: 406-411

  • By including small molecules with block copolymers in polymer nanocomposites, various types of nanoparticle can be positioned within the composite with unprecedented precision over several length scales. Moreover, the spatial distribution of nanoparticles within the combined material can be varied by exposure to heat or light, creating a new route to stimuli-responsive materials.

    • Yue Zhao
    • Kari Thorkelsson
    • Ting Xu
    Research
    Nature Materials
    Volume: 8, P: 979-985

  • Chemical design strategies developed in the last decade for conjugated polymer binders in lithium-ion batteries (LIBs) are reviewed here. The first part of this review discusses the mechanism of operation and role of binders in LIBs, and the importance of conductivity in advanced binder systems. The second part of this review gives an account of various conducting polymer binders developed for cathodes and anodes of LIBs. The review concludes with an emphasis on sustainable synthetic design strategies for next-generation conducting polymer binders for greener electrochemical energy storage systems.

    • Pratyusha Das
    • Barry C. Thompson
    Reviews
    Polymer Journal
    Volume: 55, P: 317-341

  • Poly(3-hexylthiophene) nanowires, microns in length and nanometers in diameter, are stably suspended in solution, and crystallize by adjusting solvent strength. Cocrystalization of P3HT with P3HT-covered CdSe nanorods gave hybrid nanostructures in which the p-type P3HT fibrils were flanked by the n-type CdSe nanorods. The close proximity and arrangement of the two materials provides direct, continuous pathways suitable for charge transport in photovoltaic devices.

    • Todd Emrick
    • Emily Pentzer
    ReviewsOpen Access
    NPG Asia Materials
    Volume: 5, P: e43

  • Our recent results in the concurrent cationic vinyl-addition and ring-opening copolymerization of vinyl ethers (VEs) and oxiranes are summarized with particular emphasis on the strategies required to generate crossover reactions between different types of monomers. Most importantly, carbocation generation via the ring-opening reaction of the oxonium ion is indispensable for the crossover reaction from oxirane to VE. This article also summarizes concurrent cationic vinyl-addition, ring-opening and carbonyl-addition terpolymerization, the copolymerization using an alkoxyoxirane through the alkoxy group transfer mechanism and the long-lived species-mediated polymerization using cyclic formals.

    • Arihiro Kanazawa
    • Sadahito Aoshima
    Reviews
    Polymer Journal
    Volume: 48, P: 679-687